Is there a camera app for IOS 9 with minimal UI?

Question

iOS

In general, I studied the review of webcams and realized that a webcam that shoots better than an Iphone costs from 7k.
Therefore, I decided to broadcast through the reflector, it is much cheaper.
Therefore, I need a program that displays the contents of the rear camera on the screen, has a minimum of functions and, most importantly, does not go into standby mode. Well, preferably free.

Answer 1

EpocCam
Mini Webcam